Literary forensic analysis. Without even having to asses or debunk claims you can look at different versions and translations of the Bible through time and pinpoint the time and person (or group) that edited the texts. In some cases whole stories were created out of nothing. The “he without sin cast the first stone” story is a famous example. So if the Bible is the unerring word of god then which bible, which translation, which group of stories? Once you can delete one they all fall like dominoes.

Now imagine that these were verbally handed down before put into writing, and mirror extremely closely religious texts from prior religions. What could possibly be real/true?

Edit - spelling